use system clang

diff --git a/build/toolchain/linux/BUILD.gn b/build/toolchain/linux/BUILD.gn
index 7bcd9d0..3d670b8 100644
--- a/build/toolchain/linux/BUILD.gn
+++ b/build/toolchain/linux/BUILD.gn
@@ -61,15 +61,17 @@ gcc_toolchain("x86") {
 }
 
 gcc_toolchain("clang_x64") {
-  if (use_clang_type_profiler) {
-    prefix = rebase_path("//third_party/llvm-allocated-type/Linux_x64/bin",
-                         root_build_dir)
-  } else {
-    prefix = rebase_path("//third_party/llvm-build/Release+Asserts/bin",
-                         root_build_dir)
-  }
-  cc = "${compiler_prefix}$prefix/clang"
-  cxx = "${compiler_prefix}$prefix/clang++"
+#  if (use_clang_type_profiler) {
+#    prefix = rebase_path("//third_party/llvm-allocated-type/Linux_x64/bin",
+#                         root_build_dir)
+#  } else {
+#    prefix = rebase_path("//third_party/llvm-build/Release+Asserts/bin",
+#                         root_build_dir)
+#  }
+#  cc = "${compiler_prefix}$prefix/clang"
+#  cxx = "${compiler_prefix}$prefix/clang++"
+  cc = "${compiler_prefix}clang"
+  cxx = "${compiler_prefix}clang++"
 
   ar = "ar"
   ld = cxx
